432 THE ANNELIDA POLYCHAETA. 



the second and third somite. Those of the first pair are closer together than 

 those of the second. 



The fu'st notopodia, occurring on the fourth somite, are but shght promi- 

 nences. Caudad the notopodia increase gradually in length. In the mid- 

 thoracic region they are short, proportionately stout, cylindrical processes of 

 nearly uniform thickness throughout, and with the distal end truncate a little 

 obUquely. 



On the sixth and seventh somites there is on the dorsal surface just caudo- 

 mesad of each notopodium a pit-like depression in which there is a short process 

 or tubercle. 



The notopodial setae begin on the fourth somite, the uncini on the fifth. 

 So far as observed, the uncini were in single series, both anteriorly and caudally, 

 though there is some chance that in the intermediate somites some double series 

 may occur. In the uncini the convex edge has a pronounced, suberect, angular 

 shoulder, about one third the length from caudal end, with a slight tubercle on 

 the free edge close to the angle of the shoulder. At the anterior end the plate 

 narrows to a slender, acute process. On the free edge there is a small, subacute 

 process between the base of the large fang and the acute end of the plate, the 

 process nearer the fang than the end. The principal tooth bends back nearly 

 parallel with the free edge and ends in a very acute tip near the level of the 

 process or ligament attachment. Above the main tooth are two transverse 

 series of smaller teeth, of which the teeth after the terminal series are exceedingly 

 small, or obsolete, and closely appressed in the interval between the others, so 

 often detected only with difficulty. Opposite the shoulder the body of the plate 

 is fibrillate, the fibrillae few, but strongly marked, and extending crosswise, as 

 usual, and into the teeth. In the principal series the teeth are, moreover, 

 apparently commonly from 7-9 in number. (Plate 79, fig. 11). The noto- 

 podial setae are of the usual structure, curved distally, with finely acute tips, 

 distinctly bilimbate, and shafts strongly fibrillate. (Plate 79, fig. 10). 



Locality. Gulf of California: Sta. 3435 (lat. 26° 48' N., long. 110° 45' 

 20" W.). Depth 859 fms. Bottom of brown mud with black specks. Bottom 

 temp. 37.3° F. 22 April, 1891. One specimen. 



EupoLYMNiA Verrill. 



Trans. Conn. acad. sci., 1900, 10, p. 660. 



Polymnia Malmgren, Annulata Polychaeta, 1867, p. 108; Mahenzbller, Sitzungsb. K. akad. wissensch. 

 Wien, 1884, 89, p. 199. (now preoc.) 



